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A frit is used in a glaze recipe in order to

  • A.render soluble or toxic materials insoluble and safe
  • B.increase the melting point of the finished glaze layer
  • C.colour the glaze without any pigment at all being added
  • D.make the finished glaze opaque rather than transparent

Answer: A

Correct answer: render soluble or toxic materials insoluble and safe

A frit is made by melting the raw materials to a glass, quenching and grinding it, so that soluble or toxic constituents are locked into the glass structure. Lead and boron are the usual reasons - raw lead compounds are toxic to handle and borax is soluble in the glaze slop, which would let it migrate into the body and change the recipe.

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